Search

We present novel realizations of E-model inflation within Supergravity which are largely associated with the existence of a pole of order one in the kinetic term of the (gauge-singlet) inflaton superfield. This pole arises due to the selected logarithmic Kähler potentials K 1 and K ~ 1 , which parameterize the same hyperbolic manifold with scalar curvature R K = - 2 / N , where (- N) < 0 is the coefficient of a logarithmic term. The associated superpotential W exhibits the same R charge with the inflaton-accompanying superfield and includes all the allowed renormalizable terms. For K = K 1 , inflation can be attained for N = 2 at the cost of some tuning regarding the coefficients of the W terms and predicts a tensor-to-scalar ratio r at the level of 0.001. The tuning can be totally eluded for K = K ~ 1 , which allows for quadratic- and quartic-like models with N values increasing with r and spectral index n s close or even equal to its present central observational value. [ABSTRACT FROM AUTHOR]

We show that models of chaotic inflation based on the ϕp potential and a linear non-minimal coupling to gravity, fR=1+cRϕ, can be done consistent with data in the context of Supergravity, retaining the perturbative unitarity up to the Planck scale, if we employ logarithmic Kähler potentials with prefactors -p(1+n) or -p(n+1)-1, where -0.035≲n≲0.007 for p=2 or -0.0145≲n≲0.006 for p=4. Focusing, moreover, on a model employing a gauge non-singlet inflaton, we show that a solution to the μ problem of MSSM and baryogenesis via non-thermal leptogenesis can be also accommodated. [ABSTRACT FROM AUTHOR]

Models of induced-gravity inflation are formulated within Supergravity employing as inflaton the Higgs field which leads to a spontaneous breaking of a U(1)B-L symmetry at MGUT=2·1016GeV. We use a renormalizable superpotential, fixed by a U(1) R symmetry, and Kähler potentials which exhibit a quadratic non-minimal coupling to gravity with or without an independent kinetic mixing in the inflaton sector. In both cases we find inflationary solutions of Starobinsky type whereas in the latter case, others (more marginal) which resemble those of linear inflation arise too. In all cases the inflaton mass is predicted to be of the order of 1013GeV. Extending the superpotential of the model with suitable terms, we show how the MSSM μ parameter can be generated. Also, non-thermal leptogenesis can be successfully realized, provided that the gravitino is heavier than about 10TeV. [ABSTRACT FROM AUTHOR]